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From Jeff Trawick <traw...@attglobal.net>
Subject atomicity of writes on APR pipes, PR 20295
Date Wed, 04 Jun 2003 17:52:35 GMT
see http://www.apache.org/~trawick/PR20295/pipes_are_not_atomic.patch
and http://nagoya.apache.org/bugzilla/show_bug.cgi?id=20295

apr_file_write() and its callers are not properly dealing with the 
atomic nature of some pipe write operations on Unix-ish systems.  I 
suggest that it is reasonable to drop any promise that such operations 
were atomic (if indeed any promise was ever made), and that the most 
practical solution can then be implemented.

Attempting to preserve the Unix behavior that a write for <= PIPE_BUF 
bytes will only work if the entire "message" can be written has a less 
clear and less efficient solution to the current breakage.



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